I use a app to open my project。At the moment when load over，the momery usage increase about 350mb，andlead the app down。
Could anyone so kind to give me some suggestions？
Thank you very much indeed。
Do you have a link to your project? What devices are you talking about?
When you talk about memory usage what do you mean? RAM or VRAM? Usually this will happen if you have huge models / textures.
See here for a tutorial on optimization http://developer.playcanvas.com/en/user-manual/optimization/guidelines/