中文数据库也可以的

Meta-analyses using articles has nothing to do with language, as long as the research topics are similar. you could quantify the variations of the study (both in Chinese or other languages) by adding covariates in your model. Usually, you get better results if the studies you chose follow very similar study designs, then your accuracy or Q and I2 will be minimized. For your reference, take a look at the R package, https://cran.r-project.org/web/packages/meta/meta.pdf, they have examples that you could try.

可以做的，可以用很多软件做！但是要发表好的杂志，最好有英文的一起。

请问在输入数据的时候怎样输入样本数和相关系数

是的，就是这样