A study analyzing 25,000 Huawei resumes found links between Huawei employees and Chinese military and intelligence agencies.
Huawei is currently engaged in a fight with the US.
The fight is over whether it acts as a conduit through which the Chinese government can spy. Huawei denies this.
While the study is not conclusive, it is likely to further exacerbate anxiety about the Chinese tech giant.
Business Insider reports that Huawei said it was skeptical of the findings.
"We hope that any further research papers will contain less conjecture when drawing their conclusions," it told the Financial Times.