The English writing of Xu Haijun is
Xu Haijun
Reason
If it is used on the passport or when going abroad, it is used Hanyu Pinyin means
But it is different from Hanyu Pinyin
1) The first letter of the surname placed in front should be capitalized. If it is a compound surname, together, it is also the first letter. Capital letters
2) If the name is two words, it should be written together, with the first letter capitalized.
3) Tone cannot be marked in English