Abstract  Based on a domestic market investigation of shield guidance systems, this paper presents the guidance systems with total stations and gyroscopes; discusses the composition and theory based on the classification of shield guidance systems; compares and summarizes six guidance systems with total stations in terms of system background, hardware, software and service; and finally forecasts the development tendency of shield guidance system and puts forward some relevant suggestions. 
     
   
 
  		 
         
  
    Keywords : 
    	    	
Shield machine    
      	
Guidance system    
      	
Laser target    
      	
Prism    
      	
Development tendency    
      	   
   
  
    Abstract : 
    	    	Based on a domestic market investigation of shield guidance systems, this paper presents the guidance systems with total stations and gyroscopes; discusses the composition and theory based on the classification of shield guidance systems; compares and summarizes six guidance systems with total stations in terms of system background, hardware, software and service; and finally forecasts the development tendency of shield guidance system and puts forward some relevant suggestions.
    	    	 
   
    
    Keywords :
                    	    	Shield machine  ,  
      	Guidance system  ,  
      	Laser target  ,  
      	Prism  ,  
      	Development tendency    
      	   
     
  
  
    
              
   
         
 
 
                          
                        
                        
                      
                      
                      
                      
                      
      
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