The study of infall motion helps us to understand the initial stages of star formation. In this paper, we use the IRAM 30-m telescope to make mapping observations of 24 infall sources confirmed in previous work. The lines we use to track gas infall motions are HCO + (1-0) and H 13 CO + (1-0). All 24 sources show HCO + emissions, while 18 sources show H 13 CO + emissions. The HCO + integrated intensity maps of 17 sources show clear clumpy structures; for the H 13 CO + line, 15 sources show clumpy structures. We estimated the column density of HCO + and H 13 CO + using the RADEX radiation transfer code, and the obtained [HCO + ]/[H 2 ] and [H 13 CO + ]/[HCO +] of these sources are about 10 −11 -10 −7 and 10 −3 -1, respectively. Based on the asymmetry of the line profile of the HCO + , we distinguish these sources: 19 sources show blue asymmetric profiles, and the other sources show red profiles or symmetric peak profiles. For eight sources that have double-peaked blue line profiles and signal-to-noise ratios greater than 10, the RATRAN model is used to fit their HCO + (1-0) lines, and to estimate their infall parameters. The mean V in of these sources are 0.3 -1.3 km s −1 , and theṀ in are about 10 −3 -10 −4 M yr −1 , which are consistent with the results of intermediate or massive star formation in previous studies. The V in estimated from the Myers model are 0.1 -1.6 km s −1 , and theṀ in are within 10 −3 -10 −5 M yr −1 . In addition, some identified infall sources show other star-forming activities, such as outflows and maser emissions. Especially for those sources with a double-peaked blue asymmetric profile, most of them have both infall and outflow evidence.