A method for enhancing positioning measurement and a communications apparatus are disclosed. The method includes receiving an observed mobility difference of arrival (OTDOA) request and a search list of cells provided by a network at a second time point, comparing the received search list to a stored search list of cells which is received from the network at a first time point and stored in a database, searching at least one of the cells from the received search list by using different search ranges adjusted according to the comparison result, and storing the at least one of the cells in the database, and performing OTDOA measurements from the at least one of the cells. The corresponding communications apparatus includes a receiving module, a comparing module, a searching module, and a measuring module, configured to carry out the above-identified operations.