[]Form 56-1

The Siam Cement Group

Annual Registration Statement

As at December 31, 2005

The Siam Cement Public Company Limited

The Siam Cement Public Company Limited

March 31, 2006

Table of Contents

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|   | 1.  Risk Factors                                        | 6     |
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|   | 2.  Business Operation                                  | 10    |
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|   | 3.  Operation of Each Business Unit                     | 24    |
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|   | 4.  Research and Development                            | 60    |
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|   | 5.  Asset Used in Operation                             | 64    |
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|   | 6.  Future Projects                                     | 72    |
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|   | 7.  Legal Disputes                                      | 73    |
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|   | 8.  Capital Structure                                   | 74    |
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|   | 9.  Management                                          | 77    |
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|   | 10. Internal Control                                    | 113   |
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|   | 11. Related Company Transactions                        | 117   |
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|   | 12. Financial Position and Operating Performance        | 125   |
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|   | 13. Other related Information                           | 146   |
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