Hi Wenwei, Thank you for inviting me. First of all, the keyboard layouts on laptops, phones and pads are systematic. On laptops, the QWER layout is universal and most Chinese use the Pinyin input method. The reason why some people have difficulty using this input method might be that they are not familiar with the layout of the keys and/or Pinyin, and they have never been trained to use the keyboard efficiently. Another reason causing this difficulty is that with the Pinyin input method, one has to select the final characters even with the input method association function on. There is also an input method called "五(wǔ) 笔(bǐ) " which uses the same layout but is based on the strokes rather than the Pinyin. People who are trained to type with this input method usually type faster and make much fewer mistakes. On phones and pads, for the Pinyin input method, there are two main layouts of the keys, namely "九(jiǔ) 宫(gōng) 格(gé) " and "26 键(jiàn) ", which means "nine-pattern grid" and "26 keys" respectively. The "nine-pattern grid" input method is like a Tic-tac-toe grid with the 26 letters evenly arranged on the nine cells following the alphabetic order. This is my favourite input method on phones as the keys are bigger and I can type pretty fast with few mistakes. The "26 keys" input method is the same as that on laptops. I personally don't really like it as the keys are much smaller to type on. On phones and pads, there are also other input methods like the "handwriting input method" and the "stroke input method", which to me are designed for people who are not comfortable with the Pinyin methods. These two input methods are uaully slower as well.