kingdraw 免费的手机APP
用wps了
http://www.chis.com.cn/%D0%C2%CA%C0%BC%CD/%D2%BD%D4%BA/%B5%DA%C8%FD%C6%AA%20%20%C8%ED%D3%B2%BC%E6%CA%A9%A3%BA%CD%EA%B3%C9%BB%F9%B1%BE%BC%BC%CA%F5%D7%BC%B1%B8/%B5%DA%CE%E5%D5%C2%20%CE%C4%D7%D6%B4%A6%C0%ED%A3%BA%D7%EE%B3%A3%D3%C3%BA%CD%D7%EE%D6%D8%D2%AA%B5%C4%D3%A6%D3%C3%BC%BC%CA%F5/%B5%DA%C1%F9%BD%DA%20%B7%D6%D7%D3%BD%E1%B9%B9%CA%BD%B5%C4%B2%E5%C8%EB.htm
上面这个教你怎么用word画方程式
下面这个是个软件
http://chem.our-life.cn/soft/2006/3/2006032413474573499.html