This will depend on what type of visa you are working on, your tax status in China and the length of time you spend in the PRC within a 12 month period. Tax rates in the PRC are, in many cases, lower than other countries. This provides benefits of reducing your tax obligation on income earned from labour, from investments and also possibly on any capital gains that you realise.
Also, by structuring your employment contract properly, there are many tax deductions made available to expatriates that will assist in reducing your taxable income. These can include housing allowances, education allowances, home leave allowance, and reasonable expenses. Similarly, by structuring year-end bonuses properly, taxation burdens can be reduced.