Understanding grammar is an important part of learning any language at more than a beginner level, in my opinion. Particularly when your base language is Chinese, there are many grammatical concepts that either do not exist, or are very different in English and other European languages. But the main goal of learning English should be communication, and grammar is just the "rules of the game" that let you figure out the correct way to say something. You still need to learn pronunciation, vocabulary, and syntax in order to speak and be understood. It is not easy, but millions of people have done it, so I say "go for it"! Best of luck!

学英语要学语法，跟学中文一样。