At present, the only accurate query is official website of the State Trademark Office, but I suggest that if you have never been engaged in the intellectual property industry, you should look for an agency like Alibaba Cloud to help you search.
First, trademark inquiry needs to be classified according to industry, but appropriate inquiry methods should also be selected, such as English registration. After searching in English mode, you have to search in Pinyin mode. Graphics are more difficult to query, and it is easier to identify an element, such as tree query. It is difficult to find irregular abstract queries, even if certain conditions are met, hundreds of similar graphs need to be compared. It is impossible to judge whether it belongs to an approximate trademark without professional experience.
Second, if official website of the State Trademark Office doesn't update in real time, there will be a blind spot for three months, that is, the trademark information submitted in the last three months can't be queried, which may be exactly the same as your registration. Every month, the Trademark Office draws lots from many applicants who apply for trademarks on the same day to decide their ownership.
Therefore, before obtaining China's trademark registration certificate, no one and no organization can promise that 100% registration will be successful. We must choose a professional agency for inquiry and agency registration to avoid unnecessary losses.