Ningbo Lian Technology Co.,Ltd (SZSE:300784) shares have had a horrible month, losing 27% after a relatively good period beforehand. To make matters worse, the recent drop has wiped out a year's worth of gains with the share price now back where it started a year ago.

Even after such a large drop in price, Ningbo Lian TechnologyLtd's price-to-earnings (or "P/E") ratio of 40x might still make it look like a sell right now compared to the market in China, where around half of the companies have P/E ratios below 34x and even P/E's below 19x are quite common. However, the P/E might be high for a reason and it requires further investigation to determine if it's justified.

For instance, Ningbo Lian TechnologyLtd's receding earnings in recent times would have to be some food for thought. One possibility is that the P/E is high because investors think the company will still do enough to outperform the broader market in the near future. If not, then existing shareholders may be quite nervous about the viability of the share price.

How Is Ningbo Lian TechnologyLtd's Growth Trending?

Ningbo Lian TechnologyLtd's P/E ratio would be typical for a company that's expected to deliver solid growth, and importantly, perform better than the market.

Retrospectively, the last year delivered a frustrating 13% decrease to the company's bottom line. This means it has also seen a slide in earnings over the longer-term as EPS is down 20% in total over the last three years. So unfortunately, we have to acknowledge that the company has not done a great job of growing earnings over that time.

Weighing that medium-term earnings trajectory against the broader market's one-year forecast for expansion of 38% shows it's an unpleasant look.

In light of this, it's alarming that Ningbo Lian TechnologyLtd's P/E sits above the majority of other companies. It seems most investors are ignoring the recent poor growth rate and are hoping for a turnaround in the company's business prospects. Only the boldest would assume these prices are sustainable as a continuation of recent earnings trends is likely to weigh heavily on the share price eventually.

The Bottom Line On Ningbo Lian TechnologyLtd's P/E

Despite the recent share price weakness, Ningbo Lian TechnologyLtd's P/E remains higher than most other companies. We'd say the price-to-earnings ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

We've established that Ningbo Lian TechnologyLtd currently trades on a much higher than expected P/E since its recent earnings have been in decline over the medium-term. When we see earnings heading backwards and underperforming the market forecasts, we suspect the share price is at risk of declining, sending the high P/E lower. If recent medium-term earnings trends continue, it will place shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

There are also other vital risk factors to consider and we've discovered 3 warning signs for Ningbo Lian TechnologyLtd (1 is potentially serious!) that you should be aware of before investing here.

It's important to make sure you look for a great company, not just the first idea you come across. So take a peek at this free list of interesting companies with strong recent earnings growth (and a low P/E).

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.