[tux1001]

In flexographic printing there is no standard as in offset printing, therefore the profiles are all individually made for a specific printing process. Take a profile from those who will print your order

[tux1001]

作者: double sun

在胶印ICC文件的基础之上加以更改实地颜色、网扩等信息等，重新生成一个ICC，做为软打样参考使用，是否可行？

If I understand you correctly (I have problems with Chinese), you want to generate a profile for flexography based on the profile for offset printing.
If so, then this color profile will be too unlike the actual print. Too different offset printing and flexographic printing.

[tux1001]

作者: double sun

大概是你说的意思，在不上印刷机印刷样张的情况下，怎么样生成一个柔印ICC比较好？用PS生成ICC测试过，好像软打样效果与样张相差较大
我的英文也不好

From photoshop soft proof will be too approximate. Of course, you can set dot gain more (20-30) percent for example. You can also put a correction layer on top of the image, which with the help of "curves" will cut all gradations below 2%. But still it will all be too approximate.