In　recent　years,　solar　energy　becomes　one　of　the　most　popular　renewable　energy　resources.　Among　the　solar　energy　systems,　solar　cells　are　considered　to　be　one　of　the　most　critical　components,　which　are　naturally　fragile　during　either　fabrication　or　service.　Thus,　nondestructive　examination　of　solar　cells　is　required　practically.　In　this　research,　solar　cells　made　from　monocrystalline　silicon　are　selected　as　the　typical　samples.　The　air-coupled　ultrasonic　nondestructive　testing　system,　based　on　the　generation　and　reception　of　the　A0　mode　Lamb　waves,　will　be　adopted　for　defects　detection.　Firstly,　the　dispersion　curves　of　Lamb　waves　in　anisotropic　monocrystalline　silicon　are　calculated　theoretically,　which　provides　a　theoretical　foundation　for　analyzing　the　behavior　of　Lamb　waves　propagating　in　silicon　solar　cells.　Then,　experiments　on　monocrystalline　silicon　solar　cells　are　carried　out　by　introducing　the　air-coupled　ultrasonic　Lamb　waves.　The　amplitude　distributions　of　Lamb　waves　propagating　along　various　rotation　angles　in　silicon　solar　cells　are　obtained.　It　shows　a　strong　anisotropic　properties　of　the　tested　samples.　Finally,　artificial　cracks　in　solar　cells　are　scanned　circularly　and　laterally.　The　results　of　amplitude　distributions　give　the　scattering　pattern　of　cracks,　which　can　be　used　to　determine　whether　the　crack　breaks　through　or　not.　And　the　extracted　amplitude　cross-correlation　coefficients　can　help　to　estimate　the　length　of　them.