Abstract：As the largest single-dish telescope in the world, FAST has now largely completed its commissioning phase, with the normal operation expected to commence toward the end of 2019. We are planning its first major survey, namely, the Commensal Radio Astronomy FAST Survey (CRAFTS). Based on our own innovative technologies, CRAFTS aims to obtain drift-scan data streams of HI image, HI galaxies, pulsar search, and fast radio bursts (FRB), simultaneously. Such commensality has never before been implemented successfully, in any major radio observatory. Such unprecedented capability, coupled with the great sensitivity of FAST, has the potential to significantly advance our understanding of cold baryons both in and out of the MilkyWay, the neutron star population and its evolution, and the origins of various transient processes. For this talk, in particular, I will also introduce another survey concept for FAST, utilizing deep integration, instead. Through all FAST surveys, we aim to combine information from gases, pulsars, and transients to probe the baryonic and dark matter halo structure in the local volume.