Consequently , Singapore began to adopt Hanyu Pinyin and changed its writing system from Traditional Chinese characters to Simplified Chinese characters .
After the 1980s , due to the open door policy of mainland China , Singapore began to have greater contact with mainland China .
Singapore began to adopt Hanyu Pinyin and changed Singapore 's writing system from Traditional Chinese characters to Simplified Chinese characters .
After the 1980s , due to the open door policy of mainland China , Singapore began to have greater contact with mainland China .