Form 56-1

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Annual Registration Statement

As at December 31, 2006

The Siam Cement Public Company Limited

Table of Contents

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|   | 1.  Risk Factors                                        | 7     |
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|   | 2.  Business Operation                                  | 11    |
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|   | 3.  Operation of Each Business Unit                     | 25    |
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|   | 4.  Research and Development                            | 58    |
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|   | 5.  Asset Used in Operation                             | 62    |
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|   | 6.  Future Projects                                     | 71    |
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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                                    | 110   |
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|   | 11. Related Company Transactions                        | 114   |
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|   | 12. Financial Position and Operating Performance        | 121   |
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|   | 13. Other related Information                           | 140   |
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