The costs to prosecute someone using your trademark vary depending on the specific situation of each case.
Factors which can affect the costs include: whether you need to hire an investigator to collect the evidence on the infringing goods and the profits of the infringing party, whether you need to engage the notary public to notarise the evidence collected, where the infringing party is located in China, how much you intend to claim for compensation, etc, etc, all these will affect the costs of prosecution.
In a normal situation, the total costs for the first instance court trial could be between RMB 200,000 and RMB 500,000.