She met with China's Justice Minister Wu Aiying and Meng Jianzhu, a member of the China Communist Party's powerful politburo, and spoke at the China Executive Leadership Academy, which was attended by senior Government leaders and business executives.
She said she covered everything from ensuring officials were paid enough to live on to reduce the temptation of bribes and whistle blower legislation to requirements on banks to know their customer's usual banking so alerts were raised if there were unusual transactions - helping detect money laundering.
Ms Collins had also raised the importance of an independent judiciary, a free media, and independent Police Force, as well as measures to investigate and hold officials to account, such as the Independent Police Conduct Authority. She also invited Ms Wu to visit New Zealand. A team of China's justice officials will visit in November to learn more.
However, New Zealand does not have a totally perfect system to deal with corruption - a recent OECD report said New Zealand had to significantly increase its efforts to address foreign bribery and it was yet to ratify the UN Convention Against Corruption.
Ms Collins said that it did take foreign bribery seriously because of the need to protect New Zealand's business interests. She said further improvements were on the way and some would be included in the Organised Crime and Anti-Corruption Legislation Bill which she is due to introduce in Parliament later this year. The same bill would also include the provisions New Zealand must implement before it can ratify the UN Convention Against Corruption.
Ms Collins also visited Singapore on her return journey from China, where she looked at its electronic court system - a system she is working to introduce in New Zealand.