A fiber-optic temperature and pressure sensor array for ocean observation is built and studied experimentally. The sensor array consists of 4 subarrays. Each sensor subarray is composed of a certain number of FBG temperature sensors and FBG pressure sensors which are connected in a single optical fiber. The wavelength scanning and time division multiplexing techniques are combined to demodulate the FBG wavelengths of sensor array. The experimental results show that the wavelengths of FBGs in different subarrays can be demodulated and all the sensors can measure the temperature or pressure with high accuracy. The fiber-optic temperature and pressure sensor array and the demodulation method have great potential application in acquirement of the vertical profile of temperature in seawater.